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HD404618TF Scheda tecnica(PDF) 63 Page - Renesas Technology Corp

Il numero della parte HD404618TF
Spiegazioni elettronici  4-Bit Single-Chip Microcomputer
PDF  91 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404618TF Scheda tecnica(HTML) 63 Page - Renesas Technology Corp

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HD404618 Series
61
Large Liquid-Crystal Panel Drive and V
LCD:
To drive a large-capacity LCD, decrease the resistance of
the built-in division resistors by attaching external resistors in parallel, as shown in figure 38.
The size of these resistors cannot be simply calculated from the LCD load capacitance because the matrix
configuration of the LCD complicates the paths of charge/discharge currents flowing through the
capacitors. The resistance will also vary with lighting conditions. This size must be determined by trial
and error, taking into account the power dissipation of the device using the LCD, but a resistance of 1 to 10
k
Ω would usually be suitable. (Another effective method is to attach capacitors of 0.1 to 0.3 µF.)
Always turn off the power switch (set bit 1 of the LCR to 0) before changing the liquid crystal drive
voltage (V
LCD).
32
2
3
4
32
32
32
VCC
V2
V3
GND
V1
COM1
SEG1
to
SEG32
VCC
V2
V3
GND
V1
COM1
COM2
SEG1
to
SEG32
VCC
V2
V3
GND
V1
COM1
to
COM3
SEG1
to
SEG32
VCC
V2
V3
GND
V1
COM1
to
COM4
SEG1
to
SEG32
VCC
VLCD
VCC
VLCD
VCC
VLCD
VCC
VLCD
R
R
R
V
(V )
CC
1
V2
V3
GND
R
R
R
V
(V )
CC
1
V2
V3
GND
C
C
C
C = 0.1 to 0.3
µF
4-digit LCD
with sign
.
8-digit LCD
10-digit LCD
with sign
16-digit LCD
.
.
.
Static drive
1/2 duty cycle, 1/2 bias drive
1/3 duty cycle, 1/3 bias drive
1/4 duty cycle, 1/3 bias drive
V
≥ V
≥ GND
CC
LCD
Figure 38 LCD Connection Examples



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